Stock-Based Compensation - Schedule of Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Shares (in thousands)
Outstanding at January 1, 2015 (in shares) | shares	2,671
Exercised (in shares) | shares	(1,132)
Forfeited (in shares) | shares	(15)
Outstanding at December 31, 2015 (in shares) | shares	1,524
Exercisable at December 31, 2015 (in shares) | shares	1,244
Vested or expected to vest December 31, 2015 (in shares) | shares	1,498
Weighted Average Exercise Price
Outstanding at January 1, 2015 (in dollars per share) | $ / shares	$ 28.65
Exercised (in dollars per share) | $ / shares	23.40
Forfeited (in dollars per share) | $ / shares	29.23
Outstanding at December 31, 2015 (in dollars per share) | $ / shares	32.39
Exercisable at December 31, 2015 (in dollars per share) | $ / shares	33.33
Vested or expected to vest December 31, 2015 (in dollars per share) | $ / shares	$ 32.46
Weighted Average Remaining Contractual Term & Aggregate Intrinsic Value
Outstanding at December 31, 2015	3 years 22 days
Exercisable at December 31, 2015	2 years 7 months 21 days
Vested or expected to vest December 31, 2015	3 years 11 days
Outstanding at December 31, 2015 | $	$ 30,875
Exercisable at December 31, 2015 | $	24,033
Vested or expected to vest December 31, 2015 | $	$ 30,225